Add field for Anthropic API key in settings

[abi]

This pull request introduces a new field in the settings UI for capturing the Anthropic API key, enhancing the application's configuration capabilities.

• Adds a new input field for the Anthropic API key in the SettingsDialog component: Users can now input their Anthropic API key directly through the settings dialog. This field is accompanied by a label and placeholder text, ensuring a consistent user experience with other settings fields.
• Updates the Settings type to include an anthropicApiKey property: The Settings interface in frontend/src/types.ts is extended to include anthropicApiKey, allowing the application to store and manage the Anthropic API key as part of its settings.

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